Test BigFloat with ForwardDiff 1.10

[pkofod]

Replaces #160 and fixes the issue by restricting forwarddiff and testing with big float more generally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.69%. Comparing base (9d4e9c7) to head (6fa0568).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #169   +/-   ##
=======================================
  Coverage   90.69%   90.69%           
=======================================
  Files          10       10           
  Lines         645      645           
=======================================
  Hits          585      585           
  Misses         60       60           

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